On Sun, 8 Apr 2018, Marcin wrote:
> I noticed that when debugging some USB clocking issue that there weren't
> many ways to tell what the state of the USB clocking system was. This
> adds a few logging statements to see what the relevant code is trying to
> do.
>
> Signed-off-by: Marcin Ziemianowicz <mar...@ziemianowicz.com>
It seems like you have added more debugging lines than necessary.
> --- a/drivers/usb/host/ohci-at91.c
> +++ b/drivers/usb/host/ohci-at91.c
> @@ -70,11 +70,12 @@ static const struct ohci_driver_overrides
> ohci_at91_drv_overrides __initconst =
>
> /*-------------------------------------------------------------------------*/
>
> -static void at91_start_clock(struct ohci_at91_priv *ohci_at91)
> +static void at91_start_clock(struct ohci_at91_priv *ohci_at91, struct device
> *dev)
> {
> if (ohci_at91->clocked)
> return;
>
> + dev_dbg(dev, "Enabling hclk, iclk, and setting fclk to 48 Mhz\n");
Here you list all the clocks and give one frequency.
> clk_set_rate(ohci_at91->fclk, 48000000);
> clk_prepare_enable(ohci_at91->hclk);
> clk_prepare_enable(ohci_at91->iclk);
> @@ -104,12 +106,19 @@ static void at91_start_hc(struct platform_device *pdev)
> /*
> * Start the USB clocks.
> */
> - at91_start_clock(ohci_at91);
> + at91_start_clock(ohci_at91, &pdev->dev);
>
> /*
> * The USB host controller must remain in reset.
> */
> writel(0, ®s->control);
> +
> + /*
> + * Say what the clocks are set to.
> + */
> + dev_dbg(&pdev->dev, "hclk set to: %lu hz\n",
> clk_get_rate(ohci_at91->hclk));
> + dev_dbg(&pdev->dev, "iclk set to: %lu hz\n",
> clk_get_rate(ohci_at91->iclk));
> + dev_dbg(&pdev->dev, "fclk set to: %lu hz\n",
> clk_get_rate(ohci_at91->fclk));
Here you list all the clocks a second time and give all the
frequencies.
> }
>
> static void at91_stop_hc(struct platform_device *pdev)
Alan Stern
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